The invention discloses aerobic denitrifying bacteria deformed Pseudomonas plecoglossicida YIM DC16. The bacterial strain is preserved in the China General Microbiological Culture Collection Center on July 14th, 2015. The accession number is CGMCC No. 11077. The bacterial strain is a microbial strain with an aerobic denitrifying capability. The bacterial strains can carry out aerobic denitrifying by utilization of a plurality of carbon sources such as glucose, sodium succinate, sodium citrate, sodium acetate, sodium tartrate and the like under an oxygen or limited oxygen condition. After the bacterial strains are cultured for 36h in a liquid medium with glucose as a carbon source and with KNO3 as the only nitrogen source and in culture conditions that the temperature is 20 DEG C, the speed is 100 rpm, the initial pH is 7.5 and C/N is 15, the removal rate of nitrate nitrogen reaches 90.07%, the removal rate of the total nitrogen can also reach 76.99%, and the bacterial strains have good market application prospects.